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Journal of Materials Science & Technology 2018年第10期34卷 1756-1764页

作者： B.J.Wang D.K.Xu J.H.Dong W.Ke School of Environmental and Chemical Engineering Shenyang Ligong University CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal Research Chinese Academy of Sciences Environmental corrosion Center Institute of Metal Research Chinese Academy of Sciences

Through investigating the corrosion behavior of an as-extruded Mg-3wt%gAl-lwt%Zn （AZ31） alloy in a simulated physiological fluid of Hank＇s solution, it demonstrates that the corrosion process was depen- dent on the immersion time. Further analyses revealed that the highest corrosion resistance could be obtained at 24 h due to the formation of a compact layer of corrosion products on the sample surface. With increasing the immersion time to up to 48 h, the thickness of surface films increased gradually but obvious de-bonding of such film from the substrate could take place, resulting in a certain resilience of the overall corrosion resistance.

关键词： Magnesium Surface layer corrosion product Interface

corrosion products and Formation Mechanism During Initial Stage of Atmospheric corrosion of Carbon Steel

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Journal of Iron and Steel Research International 2008年第5期15卷 42-48页

作者： XIAO Kui DONG Chao-fang LI Xiao-gang WANG Fu-ming Beijing Key Laboratory for corrosion Erosion and Surface Technology University of Science and Technology Beijing Beijing 100083 China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The formation and development of corrosion products on carbon steel surface during the initial stage of atmospheric corrosion in a laboratory simulated environment have been studied by scanning electron microscopy （SEM） and Raman spectroscopy. The results showed that two different shapes of corrosion products, that is, ring and chain, were formed in the initial stage of corrosion. MnS clusters were found in the nuclei of corrosion products at the active local corrosion sites. The ring-shaped products were composed of lepidocrocite （γ-FeOOH） and maghemite （γ-Fe2O2 ） transformed from lepidocrocite. The chain-type products were goethite （α-FeOOH）. A formation mechanism of the corrosion products is proposed.

关键词： atmospheric corrosion corrosion product carbon steel

Fatigue and corrosion Fatigue Properties of Mg-Zn-Zr-Nd Alloys in Glucose-Containing Simulated Body Fluids

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Acta Metallurgica Sinica(English Letters) 2024年第9期37卷 1533-1550页

作者： Xue Han Dan Zhang Song Zhang Mohammed R.I.Abueida Lili Tan Xiaopeng Lu Qiang Wang Huanye Liu School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870China School and Hospital of Stomatology China Medical UniversityShenyang110001China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang110016China Shenyang National Laboratory for Materials Science Northeastern UniversityShenyang110819China

Medical bone implant magnesium(Mg)alloys are subjected to both corrosive environments and complex loads in the human *** increasing number of hyperglycemic and diabetic patients in recent years has brought new challenges to the fatigue performance of Mg ***,it is significant to study the corrosion fatigue(CF)behavior of medical Mg alloys in glucose-containing simulated body fluids for their clinical ***,the corrosion and fatigue properties of extruded Mg-Zn-Zr-Nd alloy in Hank’s balanced salt solution(HBSS)containing different concentrations(1 g/L and 3 g/L)of glucose were *** average grain size of the alloy is about 5μm,which provides excellent overall mechanical *** conditional fatigue strength of the alloy was 127 MPa in air and 88 MPa and 70 MPa in HBSS containing 1 g/L glucose and 3 g/L glucose,*** crack initiation points for alloys in air are oxide inclusions and in solution are corrosion *** corrosion rate of the alloy is high at the beginning,and decreases as the surface corrosion product layer thickens with the increase of immersion *** corrosion products of the alloy are mainly Mg(OH)_(2),MgO and a small amount of Ca-P *** electrochemical results indicated that the corrosion rate of the alloys gradually decreased with increasing immersion time,but the corrosion tendency of the alloy was greater in HBSS containing 3 g/L *** the one hand,glucose accelerates the corrosion process by adsorbing large amounts of aggressive Cl^(-)*** the other hand,glucose will be oxidized to form gluconic acid,and then reacts with Mg(OH)_(2) and MgO to form Mg gluconate,which destroys the corrosion product film and leads to the aggravation of corrosion and the accumulation of fatigue damage.

关键词： Mg alloys corrosion fatigue Glucose Gluconic acid corrosion product

Hot-corrosion mechanism of Ni-Cr coatings at 650℃ under different simulated corrosion conditions

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Journal of China University of Mining and Technology 2008年第3期18卷 444-448页

作者： OU Xue-mei SUN Zhi SUN Min ZOU Duan-lian School of Material Science and Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

The oxidation and lower temperature hot corrosion (LTHC) processes occurring on the surface of Ni-Cr coatings pro-duced by high velocity arc spray (HVAS) were studied. Several different conditions were studied under simulated boiler conditions at 650 ℃. The protection effect of an Al coating deposited by HVAS onto the Ni-Cr coating was also investigated. Microscope, X-ray diffraction and corrosion rate curves have been used to analyze corrosion mechanisms. The experimental results show that: 1) The oxidation rates are almost superposed in both air (no SO3) and in simulated coal-fired gas (containing SO3) as long as no salt was present on the surface. These rate curves show a logarithmic relationship. 2) When the surface is coated with salt (75%K2SO3 + 25%Na2SO3) the rate curve for LTHC of the Ni-Cr coated surface shows a parabolic shape in the simulated coal-fire flue gas. In air only the oxidation reaction takes place, the second type of LTHC was not seen. And 3) the Al over coating on the Ni-Cr enhances resistance to LTHC because an inter-metallic compound, Al3Ni2, forms at the Al/Ni-Cr interface and because of the increase in coating thickness.

关键词： low-temperature hot-corrosion Ni-Cr coating corrosion product corrosion rate curves

Effects of Cu on Microstructure and corrosion Behaviour of Hot-Rolled Mg-3Zn-1Y Alloys

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稀有金属材料与工程 2024年第10期53卷 2794-2804页

作者： Zhang Yuezhong Chen Xiaoting Shen Jing Wu Pengpeng Zhang Shaohua Liu Baosheng College of Chemical Engineering and Technology Taiyuan University of Science and TechnologyTaiyuan 030024China College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

The microstructure and corrosion behaviour of hot-rolled Mg-3Zn-1Y-xCu alloys(x=0,1,3,5,wt%)were *** show that all Mg-3Zn-1Y-xCu alloys mainly consist ofα-Mg matrix and Mg_(3)Zn_(6)Y *** addition of Cu element promotes the formation of MgZnCu phase,and the amount of MgZnCu phase is increased with the increase in Cu *** and immersion test results show that the corrosion resistance of Mg-3Zn-1Y-xCu alloys is deteriorated after Cu addition,which can be attributed to the influence of the microstructure of alloys and the properties of the formed corrosion product *** MgZnCu phase with high electrochemical potential accelerates the micro-galvanic corrosion as strong cathodic sites,and the decreased protection effect of the corrosion product film results from the variation in PBR value of the related compounds.

关键词： corrosion behaviour magnesium alloy microstructure MgZnCu phase corrosion product

corrosion behavior of novel Cu-Ni-Al-Si alloy with super-high strength in 3.5% NaCl solution

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Transactions of Nonferrous Metals Society of China 2017年第5期27卷 1096-1104页

作者： Jia-jun ZHU San-hua LI Lei-nuo SHEN Wu-lin YANG Zhou LI College of Materials Science and Engineering Hunan University Changsha 410082 China Hunan Province Key Laboratory for Spray Deposition Technology and Application Hunan University Changsha 410082 China School of Materials Science and Engineering Central South University Changsha 410083 China

A novel Cu?6.5Ni?1Al?1Si?0.15Mg?0.15Ce alloy with super-high strength was designed and its corrosion behavior in3.5%NaCl solution at25°C was investigated by the means of SEM observation,TEM observation and XPS *** alloy after solution treatment,80%cold rolling and aging at450°C for1h had the best comprehensive properties with hardness of HV314,electrical conductivity of19.4%IACS,tensile strength of1017MPa,and average annual corrosion rate of0.028mm/*** oxides and chloride products formed at first,followed by the formation of dyroxides *** alloy showed super-high strength,good electrical conductivity and corrosion resistant because Ni2Si hindered the precipitation of large NiAl at the grain boundary and the denickelefication of the alloy.

关键词： Cu-Ni-Al-Si alloy Ni2Si precipitate corrosion behavior average annual corrosion rate corrosion product

Localized corrosion and Phase Transformation of Simulated Archaeological Iron

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Chinese Journal of Chemical Engineering 2008年第2期16卷 299-305页

作者：王紫色许淳淳董希青 School of Material Science and Engineering Beijing University of Chemical Technology Beijing 100029 China

The corrosion behaviors of simulated archaeological iron in solution （0.06 mol·L^-1 NaCl＋0.03 mol·L^-1 Na2SO4＋0.01 mol·L^-1 NaHCO3） simulating soil water composition was investigated by potentialdynamic polarization, constant potential polarization, and simulated occluded cell （O.C.） galvanostatic tests. X-ray diffraction （XRD）, energy dispersive spectrometry （EDS）, and scanning electron microscope （SEM） were used to study the corrosion morphology and the evolution of corrosion product. The objective was to discover the transformation process of archaeological iron, and determine the distribution of chlorinated corrosion products. The results showed that the presence of crevice, cavities, and channels facilitates the localized corrosion under rusts; the autocatalytic effect increases the concentration of Fe^2＋, Cl^-, and SO4^2- , and promotes local acidification within the crevices and cavities. Meanwhile, the phase transformation of corrosion products is concluded to proceed by means of two ways. One is that the ferrous ions are transformed into different kinds of FeOOH via the intermediate Fe（Ⅱ）-Fe（Ⅲ） hydroxyl-salt （i.e. Green Rusts）; the other is that the Fe^2＋ ions are transformed into FeCl2, FeCl3, and orange powders akaganeite at the crevices and cavities.

关键词： corrosion corrosion product iron chlorine

Effects of CO_(2) gassy-supercritical phase transition on corrosion behaviors of carbon steels in saturated vapor environment

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Journal of Central South University 2021年第2期28卷 325-337页

作者： ZENG De-zhi HUANG Zhi-yao YU Zhi-ming SHI Shan-zhi YI Yong-gang LIU Cong-ping TIAN Gang SUN Yi-cheng State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500China The Second Research Institute of Civil Aviation Administration of China Chengdu 610041China Research Institute of Engineering Technology Xinjiang Oil Field CompanyPetroChinaKaramay 834000China

corrosion behaviors of P110 and N80 tubular steels in CO_(2) gas phase and supercritical(S-CO_(2))phase in a saturated water vapor environment were explored in corrosion weight loss experiments by SEM,EDS,XRD,XPS and cross-section analysis *** the increase in CO_(2) partial pressure,the average corrosion rate increased first and then *** average corrosion rate reached the maximum value under the near-critical *** CO_(2) partial pressure further increased to be above the critical pressure,the average corrosion rate gradually decreased and local aggregation of molecules was weakened.

关键词： carbon capture and storage supercritical carbon dioxide corrosion product corrosion mechanism

corrosion degradation behavior of Mg-Ca alloy with high Ca content in SBF

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Transactions of Nonferrous Metals Society of China 2015年第10期25卷 3339-3347页

作者：刘一驰刘德宝赵越陈民芳天津理工大学材料科学与工程学院天津300384 School of Mechanical Materials and Mechatronic EngineeringFaculty of Engineering and Information SciencesUniversity of Wollongong

The corrosion degradation behavior of a Mg-Ca alloy with high Ca content aiming for a potential bone repair material in the simulated body fluid（SBF） was *** microstructure and phase constitution of the pristine Mg-30%Ca（mass fraction） alloy were characterized with scanning electron microscopy（SEM） and X-ray diffraction（XRD）.The Mg-30%Ca alloy samples were immersed in the SBF for 90 d,and the morphology,composition and cytotoxicity of the final corrosion product were *** is found that Mg-30%Ca alloy is composed of α-Mg and Mg2 Ca *** the corrosion process in the SBF,the Mg2 Ca phase acts as an anode and the α-Mg phase acts as a *** final corrosion product of the Mg-30%Ca alloy in SBF includes a small amount of black precipitates and white suspended *** white suspended particles are Mg（OH）2 and the black particles are believed to have a core-shell *** cytotoxicity experiments indicate that these black precipitates do not induce toxicity to cells.

关键词： Mg-Ca alloy corrosion behavior corrosion product cytotoxicity

Initial corrosion behavior of pure zinc in simulated tropical marine atmosphereInitial corrosion behavior of pure zinc in simulated tropical marine atmosphere

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Transactions of Nonferrous Metals Society of China 2018年第12期28卷 2582-2591页

作者： Qi YIN Zhen-yao WANG Chen PAN Environmental corrosion Center Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China

The initial corrosion behavior of pure zinc in a simulated tropical marine atmosphere was investigated using gravimetric method,scanning electron microscope combined with energy dispersive spectroscopy(SEM-EDS),X-ray diffractometry(XRD),Fourier transform infrared spectrometry(FTIR)and electrochemical impedance spectroscopy(EIS).The kinetics of corrosion process is a decelerating process following the empirical equation D=At^n(ncorrosion product layer could be attributed to the formation of simonkolleite,Zn5(OH)8Cl2·H2O,which could inhibit the rate determining step,namely charge transfer step,of the electrochemical corrosion process.A model of the evolution process of the product layers formed on zinc was *** addition,the regularity of the corrosion rate of zinc as a function of the NaCl deposition rate can be described by a power function.

关键词： zinc corrosion kinetics corrosion product electrochemical impedance spectroscopy (EIS) simonkolleite